linux-kernel - [PATCH] arm64: dts: mediatek: mt8390-genio-common: Add DMIC codec for delay

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Message-Id: <20250214-genio700-amic-wakeup-delay-200ms-v1-1-0094837c62b7@collabora.com>
Date: Fri, 14 Feb 2025 15:25:48 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: kernel@...labora.com, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, Zoran Zhan <zoran.zhan@...iatek.com>, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>
Subject: [PATCH] arm64: dts: mediatek: mt8390-genio-common: Add DMIC codec
 for delay

The UL_SRC_BE DAI is connected to the MT6359 PMIC which can switch
between a headset microphone and a built-in analog microphone. Both
microphones' signals require around 200ms to settle after being enabled.
Add a dmic-codec DAI to the UL_SRC_BE dai link with the corresponding
wakeup-delay-ms to let the signal stabilize and prevent a "pop" sound.

Co-developed-by: Zoran Zhan <zoran.zhan@...iatek.com>
Signed-off-by: Zoran Zhan <zoran.zhan@...iatek.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
index a37cf102a6e928440cc88e7e8fe0225fc28ec962..6c934d70c1eadbc7af3f97af1961e629ab62ab3d 100644
--- a/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8390-genio-common.dtsi
@@ -218,6 +218,13 @@ usb_p2_vbus: regulator-9 {
 		regulator-max-microvolt = <5000000>;
 		enable-active-high;
 	};
+
+	amic_codec: amic-codec {
+		compatible = "dmic-codec";
+		#sound-dai-cells = <0>;
+		num-channels = <2>;
+		wakeup-delay-ms = <200>;
+	};
 };

 &adsp {
@@ -970,6 +977,14 @@ codec {
 			sound-dai = <&pmic 0>;
 		};
 	};
+
+	dai-link-1 {
+		link-name = "UL_SRC_BE";
+
+		codec {
+			sound-dai = <&pmic 0>, <&amic_codec>;
+		};
+	};
 };

 &spi2 {

---
base-commit: 0ae0fa3bf0b44c8611d114a9f69985bf451010c3
change-id: 20250214-genio700-amic-wakeup-delay-200ms-b7b6ae563ee0

Best regards,
-- 
Nícolas F. R. A. Prado <nfraprado@...labora.com>